Consider the following extended-LAN (bridged) Ethernet network:

a) Assume that the network has reached a stable state (no change in topology for many hours). For each LAN, show me the contents of the fields of each configuration message sent over each LAN.

b) Assume that after a) above (i.e. we have reached a steady state), bridge 4 goes down. Show me the contents of the configuration messages generated by the bridges on LAN 5, and show me which bridge will be considered to be the designated bridge of the LAN 5.

Lan4 Lan5 Lan 6 Lan 3 85 B1 B4 Lan 2 . B6 B2 B3 Lan 1 Lan4 Lan5 Lan 6 Lan 3 85 B1 B4 Lan 2 . B6 B2 B3 Lan 1